2026 enters the books as one of the two warmest years ever measured
CLI-03 · probability 66% (confidence 62%, ±10 pts) over 2026-2027 · horizon NEXT 6-18M · domain climate. Probabilistic simulation, not advice.
The reading
The ladder to beat is precise: 2024 holds the record at ≈1.60°C over pre-industrial, 2023 sits second at ≈1.48°C, 2025 came third at 1.47°C (Copernicus ERA5). 2026 opened only fifth-warmest in January, then climbed the table every month — fourth in March, joint-third in April, second in May and June — exactly as a new El Niño built toward a forecast November-January peak (NOAA CPC: ~65% odds of strong or very strong). Top-two requires the annual mean to clear roughly 1.48°C, so the year now hinges on how hard the El Niño pushes the back half. This is the fastest-resolving claim on the platform: the annual analyses land in January 2027.
What would prove this wrong
This projection is WRONG if the annual 2026 analyses from both NASA GISTEMP and Copernicus ERA5, published January 2027, rank 2026 third or lower among all calendar years on record.
Trigger events tracked
- The El Niño reaching strong intensity (ONI ≥ 1.5°C) in the Nov-Jan season, per NOAA CPC
- Global sea-surface temperatures holding near record — H1 2026 oceans already ran second-warmest
- Monthly ERA5 bulletins printing first or second place through the northern autumn
- The one natural counterforce: a major stratospheric volcanic eruption cooling the tail of the year
Causal chain
Historical precedents
If it happens
Sources
Directly related seals
Subjects this belongs to
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